Valve-gear



2 Sheets-Sheet 1. W. WILSON.

VALVE GEAR.

(No Model.)

Gm m m; 5 v, m HM. M. a W e m 6. 7 v 0 i m (No Model.) 2 Shets-Sheet 2.

W. WILSON.

VALVE GEAR.

N0. 333,76 7 Patqx tgtLian. 5, 1886.

fnvenio r.

UNITED STATES PATENT OFFICE.

XVILLIAM WILSON, OF BLOOMINGTON, ILLINOIS.

VALVE-GEAR.

SPECIFICATION forming part of Letters Patent No. 333,706, dated January 5, 1886.

Application filed Xovembor 2, 1885. Serial No. 181,680. (No model.)

To all whom it may concern:

Beit known that I, WILLIAM WILsoN, residing at Bloomington, in the countyof McLean and State of Illinois,and a citizen of the United States, have invented a new and useful Improvement in Valve-Gears for Steam-Engines, of which the following is a full description, reference being had to the accompanying drawings, in which- Figure 1 is an elevation looking at the inside right hand. Fig. 2 is aplan. Fig. 3 is a section at line :20 of Fig. 1. Fig. 4 is a detail. Fig. 5 is a detail, being in the main a section at line y of Fig. 1. Fig. 6 is an elevation of the reversing-shaft and guides thereon. Fig. 7 is a side view of the admitting'valve lever. Fig. 8 is atop view ofthe same. Fig. 9 shows asliding block. Figs. 10 and 11 are details ofthe eccentric lever. Fig. 12 shows a sliding block. Figs. 13 and 14 are details of the slotted yoke for the exhaust-valve. Fig. 15 shows a sliding block. Fig. 16 is a detail showing part of the connection between the slotted yoke and exhaust-valve. Fig. 17 is an illustrative figure. Figs. 6 to 16 are enlarged.

Letters Patent of the United States for improvement in valve-gear were granted to me September 29, 1885, No. 327,047. The leading objects of that invention were to secure a more perfect movement of the valve or valves, and at the same time maintain a constant lead, and also to provide devices to prevent the vertical movement of the axle of a locomotive from affecting the action of the valve-lever. I accomplished those objects by causing the eccentric lever to travel over a fulcrum supported upon a radius-bar having one end supported on the axle and the other by a fixed center, and by other devices, as described in said patent.

I have made an improvement on that invention, for which I have caused an application for a patent to be prepared. The leading object of that improvement is to secure the desired movement of the valves and maintain a constant lead by more simple devices than those described in my said patent.

As shown in my former patent, the eccentric lever is fulcru med at a point between the axle and the center of the lever, and the oval path in which the forward end of the eccentric lever moves has its largest diameter transverse to the lever.

In carrying out theimprovement for which I have caused an application for a patent to be prepared, as above stated, the fulcrum of the eccentric lever is located forward of its center, and its forward end moves in an oval path, the longest diameter of which is in line with the eccentric lever, and the shortest diameter or such oval is equal to twice the combined lead and lap of the valve; hence a con stant lead is maintained. This feature I retain in my present application.

The leading object ofthisinvention is to provide for operating two valves by means of a single eccentric lever, one being the admission-valve and the other the exhaustvalve, and at the same time provide for a simple and correct movement of the valves and maintain a constant lead with the admission-valve and a constant release with the exhaust-valve, which I accomplish as illustrated in the drawings and hereinafter described.

My improvement is designed to be used either with locomotives or stationary engines. I will describe my improvement adapted to be used with a locomotive.

In the drawings, A represents the axle.

B is an eccentric lever connected at one end with the aXle and operated thereby, as usual.

0 is a radius-bar one end of which is arranged on the axle and concentric therewith, and its forward end is supported by the frame. As shown, such forward end is pivoted to a block, a, Fig. 4, which is located in a short slot in the frame, to permit aslight movement of the block as the axle rises and falls. As shown, this radius-bar is made in two parts, I) c, which are joined together by bolts, as shown in Figs. 1 and 5, thejoined parts being enlarged and provided with an opening, through which the eccentric lever passes. This opening has a chamber, (1, on each side, in which is located a sliding block, e, Fig. 12, and the eccentric lever is provided with trunnions f, pivoted in such sliding blocks.

D is a lever one end of which is pivoted to the forward end of the eccentric lever, and through this lever the admission-valve is 0perated. This lever passes through a guide, 9,

which is secured to a reversing-shaft, E. The formly operated; and the construction and ar- 5 5 lever is pivoted in sliding blocks 71. in the guide by means of trunnions t, Figs. 8 and 9. The forward end of this lever D is pivoted to a 5 sliding block, which moves in a slotted yoke, j, which yoke is secured to a rod, is, which extends downward therefrom through a bearing, 2.

m is a link,the lower end of which is pivoted to 10 the yokej. To its upper end is pivoted one end of an arm or lever, n, the other end of which is secured to a short shaft, F, supported in a bearing on the frame, which bearing is not shown in the drawings.

o is another arm the lower end of which is secured to the opposite end of the shaft F, and its upper end is pivoted to the valve rod G, which is connected with the admissionvalve.

H is another lever one end of which is pivoted to the forward end of the eccentric lever. This lever passes through a guide, g, upon a reversing-shaft, E, and is pivoted therein by means of sliding blocks and trun- 2 nions, as before described. The forward end of this lever H is pivoted in sliding blocks, which move in a slotted yoke, j, which yoke has a rod, k, extending down therefrom, which passes through suitable bearings, Z.

0 F is a short shaft supported on the frame,

the bearing for which is not shown.

a is an arm or lever one end of which is secured to the shaft F, and the other end is connected with the slotted yoke j.

0, another arm, the lower end of which is secured to the shaft F, and its upper end is pivoted to the valve-rod G, which operatesthe exhaust-valve.

I represents a steam cylinder and chest 0 provided with an admission-valve and an eX- haust-valve separate from each other.

J is a lever for operating the reversing-shaft E. A similar lever (not shown in the drawings) is provided on the opposite side for op- 5 crating the reversing-shaft E.

The operation is as follows: The eccentric lever B being fulerumed in the radius-bar and moving back and forth therein, its forward end will describe an oval the longest diameter of which will be in line with the eccentric lever, and the movement of the forward end of this lever will operate the two levers D H, and through the described connections both the admission and exhaust valves will be unirangement of the parts is such that the admission-valve will have a constant lead and the exhaust-valve a constant release, which is an important result. The reversing-shafts E E are to be operated in the usual manner.

For stationary engines the radius-bar is not necessary, and the eccentric lever may be ful crumed and move in a support and guide secured to the frame, instead of being connected with a radius-bar, and in such case a main shaft takes the place of the axle.

I have only shown the valve-gear for one side of a locomotive. Of course this valve gear is to be duplicated for the other side.

The forward end of the eccentric lever always moves in the same oval path; but the forward ends of the levers D H can be made to move in any necessary oval path by means of the reversing-shafts.

The location of the slotted yoke j is such that the lever 12 cannot be properly pivoted directly to the yoke, and such lever n is therefore pivoted to a pin, p, at the lower end of a connectingpiece, q, the upper end of which is pivoted to a pin, 1", at the upper part of the yoke. (See Figs. 14 and 16.)

WVhat I claim as new, and desire to secure by Letters Patent, is as follows:

1. The combination of an axle or main shaft, an eccentric lever fulcru med forward of its center, and two levers. D H, one to operate an admission-valve and the other to operate an exhaust valve, substantially as and for the purposes specified. v

2. The combination of an axle or main shaft, an eccentric lever fulerumed forward of its center, two levers, D H, and two reversing-shafts, each carrying aguide in which one of the two levers D H is supported and fulerumed, substantially as and for the purposes specified.

3. The combination of an axle or main shaft, an eccentric lever fulcru med forward ofits center, two levers, D H, each supported in a guide on a reversingshafaand pivoted at one end to the eccentric lever and at the other end to a slotted yoke, two valve-rods, and connections between the valve-rods and yokes, substantially as and for the purposes specified.

WILLIAM WILSON.

W'itnesses:

ALBERT H. ADAMS, E. A. WEsT. 

